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x86: make clockevents more robust
detect zero event-device multiplicators - they then cause division-by-zero crashes if a clockevent has been initialized incorrectly. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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1 changed files with 13 additions and 0 deletions
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@ -41,6 +41,11 @@ unsigned long clockevent_delta2ns(unsigned long latch,
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{
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u64 clc = ((u64) latch << evt->shift);
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if (unlikely(!evt->mult)) {
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evt->mult = 1;
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WARN_ON(1);
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}
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do_div(clc, evt->mult);
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if (clc < 1000)
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clc = 1000;
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@ -151,6 +156,14 @@ static void clockevents_notify_released(void)
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void clockevents_register_device(struct clock_event_device *dev)
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{
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BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
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/*
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* A nsec2cyc multiplicator of 0 is invalid and we'd crash
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* on it, so fix it up and emit a warning:
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*/
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if (unlikely(!dev->mult)) {
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dev->mult = 1;
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WARN_ON(1);
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}
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spin_lock(&clockevents_lock);
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